/*
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* Copyright (C) 2017 Google
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*
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* Authors:
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* Thiebaud Weksteen <tweek@google.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/efi.h>
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#include <linux/tpm_eventlog.h>
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#include "../tpm.h"
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#include "common.h"
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/* read binary bios log from EFI configuration table */
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int tpm_read_log_efi(struct tpm_chip *chip)
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{
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struct linux_efi_tpm_eventlog *log_tbl;
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struct tpm_bios_log *log;
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u32 log_size;
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u8 tpm_log_version;
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if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
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return -ENODEV;
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if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
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return -ENODEV;
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log = &chip->log;
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log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB);
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if (!log_tbl) {
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pr_err("Could not map UEFI TPM log table !\n");
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return -ENOMEM;
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}
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log_size = log_tbl->size;
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memunmap(log_tbl);
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if (!log_size) {
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pr_warn("UEFI TPM log area empty\n");
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return -EIO;
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}
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log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size,
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MEMREMAP_WB);
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if (!log_tbl) {
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pr_err("Could not map UEFI TPM log table payload!\n");
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return -ENOMEM;
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}
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/* malloc EventLog space */
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log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
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if (!log->bios_event_log)
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goto err_memunmap;
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log->bios_event_log_end = log->bios_event_log + log_size;
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tpm_log_version = log_tbl->version;
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memunmap(log_tbl);
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return tpm_log_version;
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err_memunmap:
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memunmap(log_tbl);
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return -ENOMEM;
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}
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